
x1, y1, x2, y2= map(float, input().split())

apple = ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))**0.5

print('{:.5f}'.format(apple)) x1, y1, x2, y2= map(float, input().split()) x1 map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 apple = ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))**0.5 apple ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))**0.5 (x1-x2)*(x1-x2) + (y1-y2)*(y1-y2) (x1-x2)*(x1-x2) x1-x2 x1 x2 x1-x2 x1 x2 (y1-y2)*(y1-y2) y1-y2 y1 y2 y1-y2 y1 y2 0.5 print('{:.5f}'.format(apple)) print '{:.5f}'.format(apple) '{:.5f}'.format '{:.5f}' format apple y2= map(float, input().split()) map(float, input().split()) y2 apple = ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))**0.5 ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))**0.5 apple y1, x2, y2= map(float, input().split()) map(float, input().split()) y1 x2, y2= map(float, input().split()) map(float, input().split()) x2 x1, y1, x2, y2= map(float, input().split()) map(float, input().split()) x1

x1, y1, x2, y2= map(float, input().split())

apple = ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))**0.5

print('{:.5f}'.format(apple))
